Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (7): 1338-1344.doi: 10.3866/PKU.WHXB201504301

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Synthesis of CdS with Large Band Gap Values by a Simple Route at Room Temperature

LI Hui1, LIU Xiang-Xin1, ZHANG Yu-Feng1, DU Zhong-Ming1, YANG Biao1, HAN Jun-Feng2,3, BESLAND Marie-Paule3   

  1. 1 The Key Laboratory of Solar Thermal Energy and Photovoltaic System, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China;
    2 School of Physics, Beijing Institute of Technology, Beijing 100081, P. R. China;
    3 Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, UMR CNRS 6502, 2 rue de la Houssinière, BP 32229, 44322 Nantes Cedex 3, France
  • Received:2014-12-10 Revised:2015-04-30 Published:2015-07-08
  • Contact: LIU Xiang-Xin E-mail:shinelu@mail.iee.ac.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (51472239, 61274060), Youth Innovation Promotion Association, Chinese Academy of Sciences (Y410421C41), 100 Talents Program of IEE Chinese Academy of Sciences (Y010411C41), and 100 Talents Preferred Support Plan of the Chinese Academy of Sciences (Y210431C41).

Abstract:

We report the synthesis of CdS polycrystalline thin films deposited with 0%, 0.88%, 1.78%, 2.58%, and 3.40% (volume fraction, φ) O2 in sputtering Ar gas using a radio frequency magnetron sputtering method. The obtained CdS samples were characterized by X-ray diffraction, scanning electron microscope, Raman spectroscopy, ultraviolet-visible (UV-Vis) absorption spectroscopy, and X-ray photoelectron spectroscopy. O incorporation led to the formation of compact and small CdS grains. The band gap values of the CdS thin films deposited with 0.88%and 1.78% O2 were 2.60 and 2.65 eV, respectively, and were larger than that of CdS (2.48 eV) deposited without O2 gas in sputtering Ar gas. In contrast, the band gap values of the CdS thin films deposited with 2.58% and 3.40% O2 (2.50 and 2.49 eV, respectively) were consistent with that of CdS (2.48 eV) deposited without O2 gas in sputtering Ar+O2 gas. The CdS thin film deposited with 0.88% O2 displayed the highest crystalline quality. Subsequently, CdTe thin films were deposited by radio frequency magnetron sputtering method on the surface of the CdS thin films. The CdTe thin films were characterized before and after high-temperature anneal treatment in a CdCl2 atmosphere. The results showed that O incorporation into CdS led to the formation of considerably more closely packed and larger CdTe grains. The synthesis of CdS with large band gap values at room temperature is facile and effective using the current method. Therefore, the method presented herein is very promising for large-scale industrial production.

Key words: CdS, O incorporation, Magnetron sputtering, CdTe, Solar cell

MSC2000: 

  • O649